Free Tool
Siding Calculator
Enter the gross wall area and window/door openings to get the net siding area and squares to order.
Net area to cover
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Squares to order
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1 siding square = 100 sq ft, the standard unit siding is sold in. This is a flat-area estimate - it doesn't add extra for corner trim, starter strips, or J-channel, and doesn't account for lap siding's actual exposed coverage per course versus its nominal width. Confirm exact coverage with your specific product before ordering.
This math, built into every bid
Punchlist's reusable cost catalog keeps material quantities and pricing consistent across every siding job, not re-guessed each time.